A 31-year-old man with macroscopic haematuria, 48h after a gastrointestinal infection, has been referred to the department of Nephrology
A 31-year-old man with macroscopic haematuria, 48h after a gastrointestinal infection, has been referred to the department of Nephrology with the suspected diagnosis of IgA nephropathy.
Which SINGLE investigation could confirm the final diagnosis? Select ONE option only.
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